Scientific Calculator
Free online scientific calculator with trigonometry, logarithms, powers, roots and factorials.
Quick answer
A scientific calculator works out trigonometry, logarithms, powers, roots and factorials. For example, sin(30°) = 0.5, log(1000) = 3, √144 = 12 and 5! = 120.
Type or tap below. In degree mode, sin(30) is 0.5; switch to radians with the DEG key.
You can also type on your keyboard. Enter works out the answer; Esc clears.
Scientific calculator functions at a glance
Each example is worked out by this calculator in degree mode, so you can type it in and compare.
| Key | What it does | Example | Answer |
|---|---|---|---|
| sin, cos, tan | Sine, cosine and tangent of an angle (in the angle mode shown on the display) | sin(30) | 0.5 |
| sin⁻¹, cos⁻¹, tan⁻¹ | Inverse trigonometry: the angle for a given ratio (press 2nd first) | asin(0.5) | 30 |
| log | Logarithm to base 10 | log(1000) | 3 |
| ln | Natural logarithm, to base e | ln(e) | 1 |
| log₂ | Logarithm to base 2 (press 2nd first) | log2(8) | 3 |
| √ and ∛ | Square root and cube root | √144 | 12 |
| x² and xʸ | Square and any power | 2^10 | 1024 |
| 10ˣ and eˣ | Ten, or e, to a power | 10^3 | 1000 |
| n! | Factorial of a whole number from 0 to 170 | 5! | 120 |
| nCr | Combinations: ways to choose r from n | nCr(5,2) | 10 |
| nPr | Permutations: ordered ways to pick r from n | nPr(5,2) | 20 |
| mod | Remainder after dividing | 17 mod 5 | 2 |
| % | Divides the number before it by 100 | 200 × 10% | 20 |
| |x| | Absolute value | abs(−7) | 7 |
| 1/x | Reciprocal | 8⁻¹ | 0.125 |
| π and e | The constants pi and Euler's number | 2π | 6.28318530718 |
How to use the scientific calculator
- 1
Type or tap
Tap the keys, or type on your keyboard. You can mix both.
- 2
Pick the angle mode
Press DEG, RAD or GRAD so sin, cos and tan use the angle unit you need.
- 3
See the answer as you type
The result updates live. Press = or Enter to keep it in the history.
- 4
Reuse it
Tap Ans to use the last answer, M+ and MR for memory, or any item in the history.
Scientific calculator: common questions
- How do I calculate sin, cos and tan in degrees?
- Check that the display says DEG, then type the function and the angle. sin(30) gives 0.5, cos(60) gives 0.5 and tan(45) gives 1. Press DEG to switch between degrees, radians (RAD) and gradians (GRAD).
- What is the difference between log and ln?
- log is the logarithm to base 10, so log(1000) = 3. ln is the natural logarithm, to base e, so ln(e) = 1. Press 2nd and then log for the base 2 logarithm: log₂(8) = 3.
- How do I find a square root, cube root or power?
- Use √ for a square root (√144 = 12), ∛ for a cube root (∛27 = 3), x² to square a number and xʸ for any power (2^10 = 1024).
- How do I calculate a factorial, combinations or permutations?
- Type the number and press n!: 5! = 120. Factorials work for whole numbers from 0 to 170. For choosing r items from n, use nCr (nCr(5,2) = 10) or nPr when the order matters (nPr(5,2) = 20).
- How does the percent key work?
- The % key divides the number before it by 100: 50% = 0.5, and 200 × 10% = 20.
- How accurate is this scientific calculator?
- Answers are shown to 12 significant digits. Tiny floating-point errors are cleaned up, so 0.1 + 0.2 shows 0.3 and sin(180°) shows 0.
- Does the calculator store or send what I type?
- No. Every calculation is worked out in your browser. Your last 25 calculations and the angle mode are saved only in your own browser so they are there next time; the Clear button removes them.